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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />demonstrates that the ICE flarcs provide more clTcctivc nuclei in the critical temperature ranges <br />of - 4C to - lOCo The ICE flarcs have also been demonstrated 10 nucleate very quickly which is <br />attributed to these llarcs operating via a condensation/freezing mechanism rather than the shm.cr <br />contact nucleation mechanism. These two factors should result in faster more efTective <br />nucleation than that provided by the carlier LW~83 llarcs even though the LW-8J llarcs <br />contained more seeding material. It is likely, but not documented. that the L W.83 llares operated <br />via the slower contact nucleation mechanism. <br /> <br /> ICE vs lW83 H.,... <br />t.E.'5 . <br /> .. . . <br />t.E+t.- . U <br /> ., <br /> . ~ <br />1.e+u ~ . ~ <br /> t e <br /> . ~ <br />1.E+U.i ~ . ~ <br /> E ~ <br /> . '.,wu <br />l.E+11 + 0 <br /> - <br /> . ~ <br />1.E+10 - <br /> . - j <br /> . ~ <br />l.E+09 . z <br /> <br />0.0 <br /> <br />-5.0 <br /> <br />-10.0 -15.0 <br />Tltmperatl.lre lDeg C) <br /> <br />.20.0 <br /> <br />-25.0 <br /> <br />FiKure f(), A comparison of the actil'ation temperatures of the aero.wl-\' prm/uut/ by the LW83 <br />fIIlt//CE pyrtJIeclmics,from tests at tile CSU SimLah ill /971 am//999, respectil'('b'. <br /> <br />Up to six ground based SF6 rclea'ies from one of the three AI lOGS sites are proposed. These <br />releases would be made during convective band passages. We propose making SF6 releases as <br />long as the convective band passes O\'er the ground site. A relea'ic rate of 100 pounds ofSF6 per <br />hour will be utilized. The band durations are expected to vary from 30 minutes to two or three <br />hours based upon information from the Santa Barbara II Research Program. We will altempt to <br />sdect bands that will have durations of at least 30 minutes for testing. <br /> <br />2.2 llnccrtainlies in thc Erreclin Targelin~ or Sccding ~'Ialerials <br /> <br />A long-teml and fundamental uncertainty regarding glaciogenic winter orographic (mountain- <br />induced) cloud seeding operational programs has been whether or not the supercooled liquid <br />water (SL W) cloud volumes arc routinely treated with adequate concentrations of the seeding <br />agent. Rangno (1986) noted that achieving adequate transport and dispersion of silver iodide <br />(AgO may be the most dillicult problem facing winter orographic cloud seeding. Review articles <br />by Re}TIolds (1988) and Super (1990) concluded that achieving appropriate Agl transport and <br />dispersion remained a critical qUl.'Stion for ""'inter orographic sl."Cding.. The American <br />lFe-.lthc-r /),;,milgl:' .\/ocIiliClltion Pl'lIgnul1 23 <br />